which sentence or sentences have correct parallel structure? this weekend, i will go to soccer practice on…

Brief Explanations:

Parallel structure means using the same pattern of words to show that two or more ideas have the same level of importance. In the first sentence, the first two items ("go to soccer practice", "have dinner with friends") are in simple future tense (will + verb) but the third item ("I am excited to be going") has a different structure. In the second sentence, all three items ("go to soccer practice", "have dinner with friends", "go to a sci - fi convention") follow the pattern of "will + verb" (the "will" is implied for the second and third items as it's a list in the same sentence structure).

Answer:

The second sentence "This weekend, I will go to soccer practice on Saturday, have dinner with friends on Saturday night, and then go to a sci - fi convention on Sunday." has the correct parallel structure.